. >>> nbc news, former cia director david petraeus is expected to testify before the senate intelligence committee tomorrow. petraeus will speak at a closed hearing into the attack on the u.s. consulate in benghazi. a former colleague told nbc news that petraeus volunteered to testify. >>> an employee at a 24-hour walmart store in laurel, maryland, says the man who shot his co-worker in the parking lot this morning was acting strangely moments before that shooting. his face was covered with a hood and scarf. police found his car on fire moments after the getaway. the store manager who was shot is expected to survive. >>> 15 elementary school students had minor bumps and bruises after a school bus crash in upper marlboro today. an suv rear ended the bus on route 301. 32 students were on the bus when it happened. none had to go to the hospital. >>> we're learning more about the timeline about the murders authorities say are connected. a teenager from charlestown in maryland is charged in both cases. pat collins spoke to the people who knew the suspect. >> reporter: his name, joshua mebane.